81497610 has 32 divisors (see below), whose sum is σ = 217327680. Its totient is φ = 21732624.

The previous prime is 81497597. The next prime is 81497621. The reversal of 81497610 is 1679418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150652 + ... + 151191.

It is an arithmetic number, because the mean of its divisors is an integer number (6791490).

Almost surely, 2^81497610 is an apocalyptic number.

81497610 is an abundant number, since it is smaller than the sum of its proper divisors (135830070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81497610 is a wasteful number, since it uses less digits than its factorization.

81497610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301859 (or 301853 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 81497610 is about 9027.6026718061. The cubic root of 81497610 is about 433.5590848693.

The spelling of 81497610 in words is "eighty-one million, four hundred ninety-seven thousand, six hundred ten".